Title: A method for the separation of rhodium from iridium and the gravimetric determination of these metals
Abstract:A method is described for the analytical separation of rhodium from iridium by means of titanous chloride.Two precipitations of the rhodium, as metal, from a solution of its sulphate in sulphuric acid...A method is described for the analytical separation of rhodium from iridium by means of titanous chloride.Two precipitations of the rhodium, as metal, from a solution of its sulphate in sulphuric acid were found to be sufficient to separate it completely from iridium.Following the separation, methods are described for the determination of rhodium by precipitation with hydrogen sulphide, for the elimination of titanium by precipitation with cupferron, and for the determination of iridium by hydrolytic precipitation.An alternative method is offered in which rhodium and iridium are determined together in one sample by hydrolytic precipitation, and rhodium separately in a second sample.CONTENTS Page I. Introduction 547 II.Compounds used in the experiments 548 III.Determination of iridium by hydrolytic precipitation 549 IV.Method recommended for the separation of rhodium from iridium and for the determination of these metals 551 1. Preparation of the solution 551 2. Separation and determination of rhodium 552 3. Recovery and determination of iridium 552 V. Discussion of the method 554Read More